there is a memorial outside the firehouse to michael chip rene and thomas kaczowka. they were shot and killed by the gunman william spengler, who later killed himself. he left a rambling note in which he said he wanted to see how much of the neighborhood he could burn down and, quote, "do what i like best: killing people." o> he was equipped to go to war and kill innocent people. >> reporter: spengler had served 17 years in prison for killing his grandmother. police said today they found another body in his home, possibly his sister's. spengler had three guns, including a semiautomatic eushmaster .223 rifle. that's the same make and caliber ol the one used in the school shootings in connecticut. the newtown shootings and yesterday's ambush have fueled the debate over gun control. but while that debate intensifies, something else is spiking-- gun sales. chip reid has a look. >> at gun shows across the nation this past weekend, people stood in line hoping to get eheir hands on an a.r.-15, the military style rifle used in the newtown, connecticut, school shooting. there